MODELING GENOTYPIC AND ENVIRONMENTAL-CONTROL OF LEAF-AREA DYNAMICS IN GRAIN-SORGHUM .1. WHOLE PLANT-LEVEL
MODELING GENOTYPIC AND ENVIRONMENTAL-CONTROL OF LEAF-AREA DYNAMICS IN GRAIN-SORGHUM .1. WHOLE PLANT-LEVEL
复制标题
DOI：
10.1016/0378-4290(93)90087-4
复制
发表时间：
1993-05-01
影响因子：
5.8
通讯作者：
MUCHOW, RC
中科院分区：
文献类型：
--
作者：
HAMMER, GL;CARBERRY, PS;MUCHOW, RC
叶面积动态受基因型和环境影响的控制。在本系列论文中，建立了高粱(Sorghum biolor(L.)在整个植株和个体叶片水平上进行了研究，以检查和量化基因和环境控制。绿叶面积模型通过分别检测叶面积生产和衰老来实现。对涉及多种杂交种和环境的田间试验数据进行了整理和分析。作物是在充足的水分和养分供应下生长的，本文提出了一个在整个植株水平上模拟叶面积生产的一般框架。植物总叶面积(Tpla)的积累(没有衰老损失)由出苗开始的温度时间(TT)的Logistic函数模拟，并在开花前不久增加到最大值(Tpla(Max))。通过考察温度对完全展开叶片出苗率的影响，得出了11℃、30℃和42℃的基温、最适温度和最高温度的计算公式。因此，TT包含了温度对Tpla的主要影响。Tpla中剩余的大部分基因和环境变异与Tpla(Max)的变异有关。根据主茎总叶数(TLN)和每株可育分蘖数(FTN)来预测TPLA值，考虑到TPLAmax随TLN的曲线增加，以及连续存活的分蘖产生的总叶面积相对于主茎的总叶面积依次减少。通过影响TLN和FTN的因素介绍了对Tpla的潜在的基因和环境控制。对于生长在8个环境(种植地点和时间)的7个杂交种，这个简单的一般模型可以解释Tpla随时间变化的93%，Tpla观测值的均方根偏差为664cm2，范围为161~1302cm2。
Leaf area dynamics are controlled by genotypic and environmental influences. In this series of papers, general models of leaf area dynamics of uniculm and tillering sorghum (Sorghum bicolor (L.) Moench) at the whole plant and individual leaf levels were developed to examine and quantify both genotypic and environmental controls. Green leaf area was modelled by examining leaf area production and senescence separately. Data from field experiments involving broad ranges of hybrids and environments were collated and analysed. Crops were grown with adequate water and nutrient supply.In this paper, a general framework to model leaf area production at the whole plant level is presented. Accumulation of total plant leaf area (TPLA) (without losses due to senescence) was simulated using a logistic function of thermal time (TT) from emergence and it increased to its maximum value (TPLA(max)) shortly before flowering. To calculate TT, base, optimum and maximum temperatures of 11, 30 and 42-degrees-C respectively were derived by examining the effect of temperature on rate of appearance of fully expanded leaves. Hence, TT incorporated the major effect exerted on TPLA by temperature. Most remaining genotypic and environmental variation in TPLA was related to variation in TPLA(max). Values of TPLA(max) were predicted from total leaf number on the main culm (TLN) and fertile tiller number per plant (FTN) by allowing for a curvilinear increase in TPLA(max) with TLN and a sequential decrease in total leaf area produced by successive surviving tillers relative to that on the main culm. The potential genotypic and environmental controls on TPLA, introduced via factors affecting TLN and FTN, were considered. For seven hybrids grown in eight environments (locations and times of planting), this simple general model accounted for 93% of observed variation in TPLA with time, with a root mean square deviation of 664 cm2 for observed values of TPLA ranging from 161 to 11 302 CM2.